Sectional reinforced-concrete pole.



II. A. GRIFFIN.

SEGTIONAI. REINFORGED CONCRETE POLE.

.APPLIOATION FILED JULY I3, 1911.

A .atented Aug. 5, 1913.

wh/mgm JOHN A. Gairrnv, or Los ANGELES, CALIFORNIA.

SECTINAL REINIEOBCED-CONCRETE POLE.

Specification of Letters Patent. I

` Patented Aug. 5 1913.

Application i/led July 13, '1911. Serial No. 638,358.

To all whom it may concern Be it known that I, JOHN EL GRIFFIN, a citizen of the United States, residing at Los Angeles, in the county of Los Angeles and State of California, have invented new andI useful Improvements in Sectional Reinforced-Concrete Poles, of which the following is a specification.

This invention relates to certain new and useful improvements in sectional reinforced concrete poles, and the object vof the invention is to provide a pole formed of sections which are molded or made at a factory, and then transported to the point or points where the poles are to be erected.

The object of the invention isto provide improved and novel means for securing the sections relative to each other to form or constitute the pole. v

ln the. drawings: Figure l is a perspective view of a pole constructed in accordance with the present invention showing the same in the process of erection, Fig. 2- is a side elevation partly in section, and Fig. Bris a section on the line 3-3 of Fig. 2.

In accordance with the present invention I provide a series of sections l which are of hollow annular or cylinder-like form each being provided with a series of longitudinal spaced perforati'ons Q.

3 designates a. cement or other foundation or base which is molded with a series of vertical rods 4 embedded therein and having their upper ends extending thereabove, the rods 4 projecting into the -oase 3 so as to receive a firm and rigid foothold therein.

The rods 4 are of somewhat flexible character, that is to say, they can be bent with comparative ease to form accurate right angles with the base .3 so that the sect `inns 1 may be threaded onto the rods 4 by pissing the latter through the perforations 2 in said sections.

In proceeding in accordance with the pres ent invention the rods 4 are sprung apart or bent at their upper ends so asv to register with the perforations 2 in the lowermost section 1, after which the latter is threaded onto the rods 4 and is moved ydownwardly to a position where it engages the base 3 as depicted in Fig. 2, after which' wetv grout or cement is poured into the perforations 2 to a p oint flush. with the top ofthe lowermost section l. The rods 4 are then tied by means .of a wire structure composed ofa series of wire strands 5 which connect dia` metriiicallly opposite rods 4, which provide additional reinforcement for the rods 4. A'

series of wire connections 6 are passed about aud firmly secured -to the adjacent rods. 4,.

the connections. 6 extending about theA pel ripheral portions of the rods as clearly depicted in Fig. 3 of the drawings. i

After i.the lowermost sectiony has been po-4 sitioned as above described andthe wire binding or tying means for the rods 4 have been applied inthe manner above setforth,

and the cement has been poured into the' perforations 2, the next section is thenV threaded onto the rods 4 in a manner just describedin connection with the lo'werrnostv section, it being.understood`- that the wire binding or tying means composed ofthev wires 5 and 6 willl permit the rods 4to be moved outwardly from points above the section threaded thereonto, after which the operation described in connection with' the I .lowermost section l so as to havevthe next It will be seen from the above that the rods i 4 are continuo-us extending from the foun-` dation to the top ofthe pole, and since they i -1 are joined or connected. by the wires 5 and 6 at yintervals .occurring at the joints between adjacent sections, and since the cement when hardened causes the various parts to be firmly and rigidly related, `the polewhen completed presents one posseed of great strength and durability andby" 'reason of being formed hollow, effects a .saving in the material of which the poles are formed i y `-If .desired the perforations may be made ofl comparatively large diameter, so' that if very stift or rigid rods 4 are employe'd,

same' need. not be sprung apart to as great an extent as in cases where the perforations are of small diameter. Of course when the pole is 4formed of equal diameter from'top to bottom, as'distinguished fi'om the taper-vv ing form depicted in the drawings, the rods 4'are not required to be sprung apart at all, since they will then aline with theperfora;

tions in the sections..

8 designates concrete ller whichl occupies the space between the ends of adjacent seci tionsto act as a bond.

In cases where' the polesarevused to sup? port telephone or telegraph wires, a cross varm or'cross arms of wood, concrete, or

vthe top of the pole, which effects a great" saving since the bending stress of the pole reduces as, the top of the saine is approached. The Wire sections may be connected by Wiring, hooking, bolting orY by any other suitable means or method of joining the same together.

What is claimed is: 1. A concrete pole including a base hav- .ing a .series of spaced vertical rods 'secured thereto Which rods incline toward each other at their upper ends, a series of independent vsections each having longitudinal perforations therein which extend through the tops and bottoms thereof, the sections being threaded onto said rods and arranged in superposed order, binding 'means between the rods at the joints between the ends of.

adjacent sections, the binding means acting to draw the rods inwardly at the upper end of a lower section and to center same in the perforations of said lower section and end of the' lower section to be moved out-4 vardly to receive the next upper section, and a filler oiI grout occupying the pertora tions of the sections and surrounding the rods and the binding means Where the latter occurs between the ends ot adjacent sections.

2. A concrete pole including a base having a series of vertical rods secured thereto, a series of hollenT independent sections each havin@- a series ot' spaced longitudinal perforations therein of considerably greater diameter than the diameter of the rods, said sections being threaded onto the rods, grout in the perforations surrounding the rods, tying Wires Which extend across the interiors ot the sections and are connected to the rods to draw and hold same inwardly, and grout inclosing the tying Wires Where the latter cross the section ends and being in engages ment with the adjacent ends of adjacent sections.

ln testimony Wherof I have hereunto set my hand in presence of two subscribing witnesses.

JOHN A. GRIFFIN. 1Vlitnesses:

L. P. ABELL,

ALBERTv E. SIMMONS. 

